netdev - Re: [PATCH] TX_RING and packet mmap

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Message-ID: <20090412195203.GA11899@ioremap.net>
Date:	Sun, 12 Apr 2009 23:52:03 +0400
From:	Evgeniy Polyakov <zbr@...emap.net>
To:	Johann Baudy <johann.baudy@...-log.net>
Cc:	Herbert Xu <herbert@...dor.apana.org.au>, netdev@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Patrick McHardy <kaber@...sh.net>, jamal <hadi@...erus.ca>
Subject: Re: [PATCH] TX_RING and packet mmap

On Sun, Apr 12, 2009 at 09:27:37PM +0200, Johann Baudy (johann.baudy@...-log.net) wrote:
> I've seen that during skb_linearize(), skb_shinfo(skb)->frags[i].page
> is not lost even if pages has been put. So I can get back original
> frag address from this info in skb destructor. Can I rely on
> skb_shinfo(skb)->frags[i].page on more complicated sending paths ... ?

skb_shinfo(skb)->frags[i] can be overwritten, for example in
__pskb_pull_tail() at pull_pages: label.

-- 
	Evgeniy Polyakov
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